Can I ask you to clarify what IP are you talking about? vCenter or VAO server itself?
If you're using VAO 1.0, I'd suggest to review this guide to migrate VAO 1.0 deployment to version 2.0. The new installation scenario might be an option after moving DR to another location.

IP address change shouldn't be a problem as long as you follow these instructions.
I wouldn't recommend to migrate the whole machine on which VAO is already installed and to simply change its IP because it might be a challenge to predict possible issues.

However, please keep in mind that there is no direct upgrade to the 2.0 version. You can consider migration scenario and to install VAO 2.0 during preparation phase (pages 6-7) on a server which is located on the new DR site.